2020年10月29日にオンラインで開催した「MySQLリリースノートを見てわいわいいう勉強会（Myリノベ）Ver.8.0.22 版の冒頭資料です。

1. MySQL 8.0.22
～リリースノートを見てわいわい言う会～
2020/10/29
日本MySQLユーザ会
坂井 恵（@sakaik)
MySQL Release Note 勉強会（Myリノベ）

2. MySQLのリリースノート
• リリースノートの冒頭部分

3. 8.0.11以降のヘッダ項目
8.0.22 8.0.21 8.0.20 19 18 17 16 15 14 13 12 8.0.11
Account Management Notes o o o o o o o o
Audit Log Notes o o o o o
C API Notes o o o o
Character Set Support o o o
Compilation Notes o o o o o o o o o o
Component Notes o o
Configuration Notes o o o o o o o o o o
Connection Management Notes o o
Data Dictionary Notes o
Data Type Notes o
Debugging Notes o
Deprecation and Removal Notes o o o o o o o o o o
Error Handling o o o
Function and Operator Notes o o o
INFORMATION_SCHEMA Notes o o o
Installation Notes o o o
JSON Notes o o
Keyring Notes o o o o
Logging Notes o o o o o o o
MySQL Enterprise Notes o
Optimizer Notes o o o o o o o
Packaging Notes o o o o o o o o o o o
Parser Notes o
Performance Schema Notes o o o o o o o
Pluggable Authentication o o o o o o
Plugin Notes o o o o
Security Notes o o o o o o
Spatial Data Support o o o o o o
SQL Syntax Notes o o o o o o o
sys Schema Notes o o o o
Test Suite Notes o o o o o
Thread Pool Notes o o
XA Transaction Notes o
X Plugin Notes o o o o o o o o o o o
Functionality Added or Changed o o o o o o o o o o o
Bugs Fixed o o o o o o o o o o o o

4. MySQL 8.0.22
• リリースノートの項目と件数
Account Management Notes 3
Audit Log Notes 1
C API Notes 1
Compilation Notes 2
Configuration Notes 4
Deprecation and Removal Notes 2
Keyring Notes 1
Optimizer Notes 5
Packaging Notes 3
Performance Schema Notes 2
Pluggable Authentication 1
SQL Syntax Notes 3
X Plugin Notes 1
Functionality Added or Changed 8
Bugs Fixed 136

5. 8.0.22
引き続き「思いやり用語」対応
From MySQL 8.0.22, the statements START SLAVE, STOP SLAVE, SHOW SLAVE
STATUS, SHOW SLAVE HOSTS and RESET SLAVE are deprecated. The following
aliases should be used instead:
• Instead of START SLAVE use START REPLICA
• Instead of STOP SLAVE use STOP REPLICA
• Instead of SHOW SLAVE STATUS use SHOW REPLICA STATUS
• Instead of SHOW SLAVE HOSTS use SHOW REPLICAS
• Instead of RESET SLAVE use RESET REPLICA
The statements work in the same way as before, only the terminology used for each
statement and its output has changed.
New status variables have been added as aliases for the related status variables. Both
the old and
new versions of the statements update both the old and new versions of these status
variables:
• Com_slave_start is equivalent to Com_replica_start
• Com_slave_stop is equivalent to Com_replica_stop
• Com_show_slave_status is equivalent to Com_show_replica_status
• Com_show_slave_hosts is equivalent to Com_show_replicas

6. 8.0.22
引き続きFacebookの貢献
• Added support for periodic synchronization when writing to files with SELECT INTO
DUMPFILE and SELECT INTO OUTFILE statements. This feature can be enabled by
setting the select_into_disk_sync system variable to ON; the size of the write buffer cn
be set using the server system variable select_into_buffer_size; the default buffer size is
131072 (217) bytes. An optional delay following synchronization to disk can also be set
using the select_into_disk_sync_delay system variable; the default behaviour is not to
allow any delay (that is, a delay time of 0 milliseconds).
For more information, see the descriptions of the system variables referenced previously.
Our thanks to Facebook for this contribution to MySQL 8.0. (Bug #30284861)
• Replication: When the system variable session_track_gtids was set to
OWN_GTID on a multithreaded replica, the replica’s performance would degrade
over time and begin to lag behind the master. The cause was the buildup of the
GTIDs recorded by the replica’s worker threads at each transaction commit, which
increased the time taken by the worker threads to insert new ones. Session state
tracking is now disabled for worker threads on a multithreaded replica. Thanks to
Facebook for the contribution. (Bug #29049207, Bug #92964)

7. 全部読むのは大変！
• まず、興味のあるカテゴリから眺めてみよう
• みんなに話してみよう
• みんなの話を聞いてみよう！
他人の興味を、自分の興味のきっかけに
自分の興味を、他の人の興味のきっかけに
本会の趣旨